A DGT testing device for sampling water sediment

Abstract

The present invention relates to a water body sediment sampling DGT test device, comprising a telescopic control rod, a water body sampling test component, a sediment sampling test component and a test control component arranged in sequence from top to bottom; the water body sampling test component comprises an upper limit plate and a water sample bin arranged in sequence from top to bottom, the telescopic control rod is arranged on the top of the upper limit plate, and a plurality of water body DGTs are arranged on the upper limit plate; the sediment sampling test component comprises a lower limit plate and a sediment bin, a sediment DGT is arranged in the sediment bin, and the lower limit plate and the sediment bin are arranged in sequence below the water sample bin; the test control component is used to realize the opening and closing of the water body sampling test component and the sediment sampling test component. The present invention can solve the shortcomings of the existing sampling DGT test technology that the effective dynamic mechanism of nutrients and pollutants at the interface of water body sediment cannot be accurately reflected.

Description

Technical Field

[0001] The invention relates to the technical field of water body bottom mud testing and sampling, and in particular to a water body bottom mud sampling DGT testing device. Background Art

[0002] Thin film diffusion gradient technology (DGT) is based on the principle of free diffusion and can obtain information on the diffusion flux, (biological) effective state content and solid-liquid exchange kinetics of target ions in environmental media such as soil, water and sediment. It is an effective state determination method based on dissociation and diffusion kinetics.

[0003] There is a dynamic balance of absorption and release between water bodies and sediments. When water bodies are seriously polluted, some pollutants can enter the sediments through precipitation, adsorption and other effects; when the pollution caused by external sources is controlled, various organic and inorganic pollutants accumulated in the sediments re-enter the overlying water bodies through physical, chemical and biological exchanges with the overlying water bodies. Interstitial water in sediments exists between the pollution carriers of sediments and water bodies, and is an important indicator of the reaction mechanism between the two. The study of sediments in water bodies is of great significance to the study of the transformation of substances from water phase to sediment or from sediment to water phase.

[0004] Existing DGT testing of water sediments generally involves collecting samples using a sampling device and then conducting DGT testing in the laboratory, or inserting a DGT probe directly into the water sediment. In the former method, due to significant changes in environmental conditions during sample transfer, the pH, temperature, elemental state and other properties may also change, making the results inaccurate. In the latter method, the in-situ testing of the DGT probe makes the data results more accurate, but it is generally done by direct manual insertion. Due to limitations in depth and other aspects, it is difficult to place the DGT probe, and it is difficult to collect water sediment at the in-situ interface.

[0005] It is very necessary and urgent to implement in-situ GDT testing of sediment, water bodies and interstitial water in sediments, and simultaneously collect in-situ water body sediment samples so that the research results can accurately reflect the effective state mechanism of nutrients and pollutants at the water body sediment interface. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a DGT testing device for sampling sediment in water bodies in view of the above shortcomings. The present invention can solve the shortcomings of the existing sampling DGT testing technology that it cannot accurately reflect the effective dynamic mechanism of nutrients and pollutants at the interface of sediment in water bodies.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] A DGT testing device for sampling sediment in a water body, comprising a telescopic control rod, a water body sampling testing component, a sediment sampling testing component and a testing control component arranged in sequence from top to bottom;

[0009] The water sampling test assembly comprises an upper limit plate and a water sample chamber arranged in sequence from top to bottom, the telescopic control rod is arranged on the top of the upper limit plate, and a plurality of water DGTs are arranged on the upper limit plate;

[0010] The sediment sampling and testing assembly comprises a lower limit plate and a sediment bin, in which a sediment DGT is arranged, and the lower limit plate and the sediment bin are sequentially arranged below the water sample bin;

[0011] The test control component is arranged on the water sampling test component and the sediment sampling test component. The test control component is used to be inserted into the sediment, and after relative rotation with the water sampling test component and the sediment sampling test component, it can open or close the water sampling port on the water sample bin and the sediment sampling port on the sediment bin, and open or close the water DGT and the sediment DGT.

[0012] Furthermore, the telescopic control rod includes an inner rod and an outer rod, the outer rod is connected to the water sample chamber, the inner rod is slidably arranged in the outer rod, and control handles are arranged on the top of the inner rod and the outer rod.

[0013] Furthermore, a plurality of first installation grooves are provided on the upper limit plate, and the water body DGT is arranged in the first installation grooves.

[0014] Furthermore, a mounting portion is provided inside the sediment bin, and a mounting slot is provided on the mounting portion. The sediment DGT can be installed on the mounting portion and fixed on the mounting portion by the cooperation of the mounting slot and a fixing pin.

[0015] Furthermore, a water sample bin opening and a water sample bin baffle for closing the water sample bin opening are provided on the side wall of the water sample bin, and a water sample bottle is detachably provided in the water sample bin. When the water sample bottle is installed in the water sample bin, the bottle mouth of the water sample bottle is connected to the water sampling port on the top of the water sample bin.

[0016] Further, the test control assembly includes a fender, a first control ring and a second control ring, the side wall of the bottom mud bin is provided with a bottom mud bin opening, the side wall of the bottom mud bin is provided with a bottom mud bin baffle, the fender is rotatably arranged on the outside of the bottom mud bin, the bottom mud bin baffle, the first control ring and the second control ring are all connected to the fender, and the second control ring is provided with a control cover that cooperates with the water body DGT;

[0017] When the mud flap and the sediment bin rotate relative to each other, the mud flap will drive the sediment bin baffle, the first control ring and the second control ring to rotate. When the sediment bin baffle rotates, it will open or close the sediment bin opening to open or close the sediment DGT. When the first control ring rotates, it will open or close the water body sampling port. When the second control ring rotates, it will open or close the water body DGT.

[0018] Furthermore, a rotation limiting ring is provided at the bottom of the mud guard, and the rotation limiting ring is rotatably arranged at the bottom end of the bottom mud bin.

[0019] Furthermore, the upper limit plate and the lower limit plate are both provided with a first arc-shaped guide rail and a second arc-shaped guide rail, and the first arc-shaped guide rail and the second arc-shaped guide rail are coaxial;

[0020] The fender is provided with a first control rod and a second control rod, wherein the first control rod is connected to the first control ring after passing through all the first arc-shaped guide rails, and the second control rod is connected to the second control ring after passing through all the second arc-shaped guide rails.

[0021] Furthermore, a conical drill body is provided at the bottom of the sludge bin.

[0022] Furthermore, the water body DGT is a piston type or an inner cavity type, and the sediment DGT is a flat plate type.

[0023] After adopting the above technical solution, the present invention has the following advantages compared with the prior art:

[0024] The collection method of the present invention is convenient. Through the method of rotating opening and closing and layered collection, the overlying water sample of the vertically distributed sediment sample box can be collected in situ at the sampling point at the same time, which is convenient for sampling personnel to collect samples and increases sampling efficiency;

[0025] The present application controls the sampling and testing device by a telescopic control rod, and the control rod and the sampling and testing assembly are rigidly connected, which is easier to grasp and control than soft connections such as ropes, and the reliability and durability are greatly increased, and the cost is low;

[0026] The present invention adopts a layered design and integrates sampling and detection. It can not only simultaneously perform in-situ testing of DGT in sediment and overlying water, but also simultaneously collect in-situ samples of sediment and overlying water, so as to more truly and effectively analyze the effective state concentrations of target elements such as nutrients and metals in sediment and water, improve the accuracy of subsequent experimental research, and is suitable for the study of the distribution characteristics and mechanisms of multi-layer targets at the interface between sediment and overlying water in rivers and lakes.

[0027] The present invention is described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1is a general structural diagram of an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the assembly of the sediment DGT of the present invention;

[0030] Figure 3 is a cross-sectional schematic diagram of an embodiment of the present invention;

[0031] Figure 4 It is a schematic diagram of the structure of the water sampling and testing assembly of the present invention;

[0032] Figure 5 This is a schematic diagram of the structure of the sediment sampling and testing assembly of the present invention;

[0033] Figure 6 is a schematic diagram of a fender in a second position;

[0034] Figure 7 It is a schematic diagram of the fender being located in the first position.

[0035] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0036] 1. Telescopic control rod; 11. Inner rod; 12. Outer rod; 13. Control handle; 2. Water sampling test assembly; 21. Upper limit plate; 211. First installation slot; 22. Water sample compartment; 221. Water sample compartment opening; 222. Water sample compartment baffle; 223. Water sampling port; 23. Water DGT; 24. Water sample bottle; 3. Sediment sampling test assembly; 31. Lower limit plate; 32. Sediment compartment; 321. Installation part; 3211. Mounting slot; 322. Fixing pin; 323. Bottom mud bin opening; 324. Bottom mud bin baffle; 33. Bottom mud DGT; 4. Test control assembly; 41. Mud guard; 411. First control rod; 412. Second control rod; 42. First control ring; 43. Second control ring; 431. Control cover; 44. Rotation limit ring; 51. First arc guide rail; 52. Second arc guide rail; 6. Conical drill body. DETAILED DESCRIPTION

[0037] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0038] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", "clockwise" and "counterclockwise" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0039] like Figure 1 , Figure 2 and Figure 3 As shown, a DGT test device for sampling sediment in a water body comprises a telescopic control rod 1, a water body sampling test component 2, a sediment sampling test component 3 and a test control component 4 which are arranged in sequence from top to bottom;

[0040] The water sampling test assembly 2 includes an upper limit plate 21 and a water sample chamber 22 arranged in sequence from top to bottom, the telescopic control rod 1 is arranged on the top of the upper limit plate 21, and a plurality of water body DGTs 23 are arranged on the upper limit plate 21;

[0041] The bottom sediment sampling test assembly 3 includes a lower limit plate 31 and a bottom sediment bin 32, in which a bottom sediment DGT 33 is arranged, and the lower limit plate 31 and the bottom sediment bin 32 are sequentially arranged below the water sample bin 22;

[0042] The test control component 4 is arranged on the water sampling test component 2 and the sediment sampling test component 3. The test control component 4 is used to be inserted into the sediment, and after relative rotation with the water sampling test component 2 and the sediment sampling test component 3, it can open or close the water sampling port 223 on the water sample chamber 22 and the sediment sampling port on the sediment chamber 32, as well as open or close the water DGT23 and the sediment DGT33.

[0043] Embodiment 1:

[0044] A DGT testing device for sampling sediment in a water body comprises a telescopic control rod 1, a water body sampling testing component 2, a sediment sampling testing component 3 and a conical drill body 6 which are arranged in sequence from top to bottom.

[0045] like Figure 3 and Figure 4 As shown, the water sampling test assembly 2 includes an upper limit plate 21 and a water sample chamber 22. The upper limit plate 21 is horizontally arranged on the top of the water sample chamber 22. Four first installation grooves 211 are evenly arranged on the top of the upper limit plate 21. A water DGT 23 is arranged in each first installation groove 211.

[0046] A water sample bin opening 221 is provided on the side wall of the water sample bin 22, and a water sample bin baffle 222 for closing the water sample bin opening 221 is provided on the side wall of the water sample bin 22. A water sample bottle 24 is detachably provided in the water sample bin 22, and a water body sampling port 223 is provided on the top of the water sample bin 22. When the water sample bottle 24 is placed in the water sample bin 22, the bottle mouth of the water sample bottle 24 is connected to the water body sampling port 223.

[0047] like Figure 2 , Figure 3 and Figure 5As shown, the sediment sampling test assembly 3 includes a lower limit plate 31 and a sediment bin 32, the lower limit plate 31 is horizontally arranged at the bottom of the water sample bin 22, the sediment bin 32 is arranged at the bottom of the lower limit plate 31, a sediment bin opening 323 is provided on the side wall of the sediment bin 32, a sediment bin baffle 324 for closing the sediment bin opening 323 is provided on the side wall of the sediment bin 32, a mounting portion 321 is provided at the top end of the interior of the sediment bin 32, a plurality of mounting slots 3211 are provided on the mounting portion 321, and the sediment DGT33 can be stuck on the mounting portion 321 and can be fixed by the cooperation of the fixing pin 322 and the mounting slot 3211;

[0048] The sediment bin 32 (i.e., the sediment test control component 4) needs to be immersed in the sediment during test sampling, while the water sample bin 22 (i.e., the water body sampling test component 2) needs to be exposed to the overlying water body. The lower limit plate 31 is a large surface area annular structure with a large mass, which is convenient for the sediment bin 32 to be inserted into the sediment. It can also serve as a separation interface between the water body and the sediment to keep the sampling position and sampling depth unchanged.

[0049] A mud guard 41 is arranged on the outside of the bottom mud bin 32, and a rotation limit ring 44 is arranged on the bottom of the bottom mud bin 32. The mud guard 41 is connected with the bottom mud bin baffle 324 and the rotation limit ring 44. A first control ring 42 and a second control ring 43 are arranged on the upper limit plate 21 (i.e., the top of the water sample bin 22). A through hole cooperating with the water sampling port 223 is opened on the first control ring 42, and four control covers 431 are arranged on the second control ring 43. The first control ring 42 and the second control ring 43 can both rotate around the axis of the water sample bin 22. When the first control ring 42 rotates, the water sampling port 223 can be opened or closed. When the second control ring 43 rotates, all control covers 431 can be driven to move to open or close the water DGT.

[0050] The upper limit plate 21 and the lower limit plate 31 are both provided with a first arc guide rail 51 and a second arc guide rail 52, the first arc guide rail 51 and the second arc guide rail 52 are coaxial, and the second arc guide rail 52 is located on the outside of the first arc guide rail 51, and a vertical first control rod 411 and a second control rod 412 are provided on the top of the fender 41, the first control rod 411 is connected to the first control ring 42 after passing through the first arc guide rail 51, and the second control rod 412 is connected to the second control ring 43 after passing through the second arc guide rail 52.

[0051] The telescopic control rod 1 is used to realize the lifting and rotation of the water sample bin 22 and the bottom mud bin 32. Preferably, the telescopic control rod 1 includes an inner rod 11 and an outer rod 12. The inner rod 11 is sleeved in the outer rod 12, and the inner rod 11 and the outer rod 12 can slide relative to each other. The outer rod 12 is fixed to the top of the water sample bin 22 (the upper limit plate 21). A reinforcing structure is arranged between the outer rod 12 and the water sample bin 22. Control handles 13 are arranged on the top of the inner rod 11 and the outer rod 12.

[0052] The conical drill body 6 plays a guiding role, making it easier to insert the bottom mud bin 4 into the bottom mud.

[0053] like Figure 6 As shown, the fender 41 is located in the second position. In this position, the bottom mud bin opening 323 is in an open state, so that the bottom mud can enter the bottom mud bin 32 through the bottom mud bin opening 323, the water body sampling port 223 is in an open state, and the overlying water of the bottom mud can enter the water sample bottle 24 through the water body sampling port 223, and the water body DGT23 is also in an open state;

[0054] like Figure 7 As shown, the mud guard 41 is located in the first position. When the mud guard 41 is switched from the second position to the first position, the bottom mud bin baffle 324 will close the bottom mud bin opening 323, the first control rod 411 will move along the first arc guide rail 51, and drive the first control ring 42 to rotate to close the water sampling port 223, the second control rod 412 will move along the second arc guide rail 52, and drive the second control ring 43 and the control cover 431 to rotate, thereby closing the water body DGT23 through the control cover 431.

[0055] Preferably, the water body DGT is piston type or inner cavity type; preferably, the sediment DGT is flat plate type, which can be single-sided or double-sided, and different types of DGT can be installed according to needs.

[0056] A DGT testing method for water body sediment sampling comprises the following steps:

[0057] Rotate the fender 41 to the first position. When the fender 41 rotates to the first position, the bottom mud bin baffle 324 closes the bottom mud bin opening 323, the control cover 431 closes the water body DGT23, and the first control ring 42 closes the water body sampling port 223;

[0058] The water sampling test assembly 2 and the bottom sediment sampling test assembly 3 are placed at the sampling test point of the river or lake, and the bottom sediment sampling test assembly 3 is immersed in the bottom sediment by adjusting the length of the telescopic control rod 1, and the water sampling test assembly 2 is exposed in the overlying water body;

[0059] The water sampling test assembly 2 and the bottom sediment sampling test assembly 3 are driven to rotate by the telescopic control rod 1. Due to the obstruction of the bottom sediment to the fender 41, the fender 41 rotates relative to the water sample bin 22 and the bottom sediment bin 22, so that the fender 41 rotates to the second position to open the bottom sediment bin opening 323. When the fender 41 rotates, it drives the first control rod 411 to move to the second position along the first arc-shaped guide rail 51 to drive the first control ring 42 to rotate to open the water sampling port 223, and also drives the second control rod 412 to rotate to the second position along the second arc-shaped guide rail 52, and drives the second control ring 43 to rotate, so that the control cover 431 is away from the water body DGT23 to open the water body DGT23. In this case, the bottom sediment and the water body can be collected at the same time, and the water body DGT23 and the bottom sediment DGT33 can be tested synchronously;

[0060] After 24 hours of sampling test (the time can be adjusted according to actual conditions), the water sampling test assembly 2 and the bottom sediment sampling test assembly 3 are driven to rotate in the opposite direction by the telescopic control rod 1. Due to the obstruction of the bottom sediment to the fender 41, the fender 41 is rotated to the first position to close the bottom sediment bin opening 323, the water sampling port 223, the water DGT23 and the bottom sediment DGT33;

[0061] The water body sampling test component 2 and the bottom sediment sampling test component 3 are recovered to complete the sampling test.

[0062] After the recovery device, from top to bottom, first remove the water body DGT23 from the first installation groove 211, and open the water sample bin baffle 222, take out the water sample bottle 24 from the water sample bin 22 for storage, place the sediment sampling test assembly 3 horizontally, rotate the sediment bin baffle 324 to open the sediment bin opening 323, and the sediment sample in the sediment bin 32 can be directly exposed longitudinally, which is convenient for observing the sediment sample or sampling and analyzing layer by layer. After the sediment sample is taken, the sediment DGT33 can be recovered.

[0063] Water samples and sediment samples are refrigerated, and water DGT23 and sediment DGT33 are classified and stored in the refrigerator according to relevant instructions. After being transported back to the laboratory, the samples and DGT are further analyzed and processed.

[0064] The above is an example of the best implementation of the present invention, and the parts not described in detail are common knowledge of ordinary technicians in the field. The protection scope of the present invention shall be based on the content of the claims, and any equivalent transformation based on the technical enlightenment of the present invention is also within the protection scope of the present invention.

Claims

1. A DGT testing device for sampling sediment in water bodies, characterized in that: It comprises a telescopic control rod (1), a water sampling test component (2), a bottom mud sampling test component (3) and a test control component (4) which are arranged in sequence from top to bottom; The water body sampling test assembly (2) comprises an upper limit plate (21) and a water sample chamber (22) arranged in sequence from top to bottom, the telescopic control rod (1) is arranged on the top of the upper limit plate (21), and a plurality of water body DGTs (23) are arranged on the upper limit plate (21); The sediment sampling test assembly (3) comprises a lower limit plate (31) and a sediment bin (32), wherein a sediment DGT (33) is arranged in the sediment bin (32), and the lower limit plate (31) and the sediment bin (32) are arranged in sequence below the water sample bin (22); The test control component (4) is arranged on the water sampling test component (2) and the bottom sediment sampling test component (3); the test control component (4) is used to be inserted into the bottom sediment, and after rotating relative to the water sampling test component (2) and the bottom sediment sampling test component (3), it can open or close the water sampling port (223) on the water sample chamber (22) and the bottom sediment sampling port on the bottom sediment chamber (32), and open or close the water DGT (23) and the bottom sediment DGT (33); The test control assembly (4) comprises a fender (41), a first control ring (42) and a second control ring (43); a side wall of the bottom mud bin (32) is provided with a bottom mud bin opening (323); a bottom mud bin baffle (324) is arranged on the side wall of the bottom mud bin (32); the fender (41) is rotatably arranged outside the bottom mud bin (32); the bottom mud bin baffle (324), the first control ring (42) and the second control ring (43) are all connected to the fender (41); and a control cover (431) that cooperates with the water body DGT (23) is arranged on the second control ring (43); When the mud baffle (41) and the bottom mud bin (32) rotate relative to each other, the mud baffle (41) drives the bottom mud bin baffle (324), the first control ring (42) and the second control ring (43) to rotate; when the bottom mud bin baffle (324) rotates, the bottom mud bin opening (323) is opened or closed, so as to open or close the bottom mud DGT (33); when the first control ring (42) rotates, the water body sampling port (223) is opened or closed; and when the second control ring (43) rotates, the water body DGT (23) is opened or closed; A first control ring (42) and a second control ring (43) are provided on the upper limit plate (21); a through hole cooperating with the water sampling port (223) is provided on the first control ring (42); four control covers (431) are provided on the second control ring (43); and both the first control ring (42) and the second control ring (43) are capable of rotating around the axis of the water sample chamber (22).

2. The DGT testing device for sampling water sediment according to claim 1, characterized in that: The telescopic control rod (1) comprises an inner rod (11) and an outer rod (12), wherein the outer rod (12) is connected to the water sample chamber (22), the inner rod (11) is slidably arranged inside the outer rod (12), and control handles (13) are arranged at the tops of the inner rod (11) and the outer rod (12).

3. The DGT testing device for sampling water sediment according to claim 1, characterized in that: A plurality of first installation grooves (211) are provided on the upper positioning plate (21), and the water body DGT (23) is arranged in the first installation grooves (211).

4. The DGT testing device for sampling water sediment according to claim 1, characterized in that: The bottom mud bin (32) is provided with a mounting portion (321) inside, and a mounting slot (3211) is provided on the mounting portion (321). The bottom mud DGT (33) can be mounted on the mounting portion (321) and fixed on the mounting portion (321) by the cooperation of the mounting slot (3211) and the fixing pin (322).

5. The DGT testing device for sampling water sediment according to claim 1, characterized in that: A water sample chamber opening (221) and a water sample chamber baffle (222) for closing the water sample chamber opening (221) are provided on the side wall of the water sample chamber (22); a water sample bottle (24) is detachably provided in the water sample chamber (22); when the water sample bottle (24) is installed in the water sample chamber (22), the bottle mouth of the water sample bottle (24) is communicated with a water sampling port (223) at the top of the water sample chamber (22).

6. The DGT testing device for sampling water sediment according to claim 1, characterized in that: A rotation limiting ring (44) is provided at the bottom of the mud guard (41), and the rotation limiting ring (44) is rotatably arranged at the bottom end of the bottom mud bin (32).

7. The DGT testing device for sampling water sediment according to claim 1, characterized in that: The upper limit plate (21) and the lower limit plate (31) are both provided with a first arc-shaped guide rail (51) and a second arc-shaped guide rail (52), and the first arc-shaped guide rail (51) and the second arc-shaped guide rail (52) are coaxial; A first control rod (411) and a second control rod (412) are provided on the fender (41); the first control rod (411) is connected to the first control ring (42) after passing through all the first arc-shaped guide rails (51); and the second control rod (412) is connected to the second control ring (43) after passing through all the second arc-shaped guide rails (52).

8. The DGT testing device for sampling water sediment according to claim 1, characterized in that: A conical drill body (6) is provided at the bottom of the bottom mud bin (32).

9. The DGT testing device for sampling water sediment according to claim 1, characterized in that: The water body DGT (23) is of piston type or inner cavity type, and the bottom mud DGT (33) is of flat plate type.

Images